Pneumatic jack



Marh 10, 1925. 1,528,856

l J. L. STRANDBERG ET Al.

PNEUMATICI JACK Filedmly 21, 1925 2 'sheets-sheet 1 (gna.

aucun,

3u unifow March 1o, 1925. 1,528,856

J. L. STRANDBERG ET AL PNEUMATIC JACK Filed July l21, .1923 2 Sheets-Sheet 2 Patented Mar. 10, 1925',

i JOHN LEO srRnNpi/s'iine Ann t La Rsniarx JULIUs BLOMBERG, or Kansas CITY, ivilrssounr. I

Parnuimitrrc- JACK. n

Appiieationmea July V21,y 19,23. serial No. esaeenA To eZZf/whomt" mayv Concern.' i

B'egit kno-wn'thatdorrn L.- STRANDBERG and Lans E mit JUL'rUsr BLOMBERQ citizens of the United'A States; residing 5 at `Kansas 6 City,in the countyA ofJacksonandfState have invented "certain newand useful Improvements-in Pneumatic Jacks, of `whichthe 4following is a specification.

In carrying out the present'iiivention it isourpurpose to provide a fhighly novelA and useful form Aofpneuniatic` liackv that is primarily but not specifically adapted for use f inconju crete forms? netion` witlr the -raising of con- Thev primary objectof rourv invention is Y to substantially improve over the -usual screw types wof`jacks now employed for this' vpurposea,y our invention being'extremely simple of construction and efficient inoperatiomthe4 saine comprising@relatively few parts, these .co-related in 'such a4 manner as to reduce the possibility ofiy disarrangement to minimum.

-o Aiiadditional ob] ect of this invention is theprovis'ion'ofjsuch' a pneumatic jack wherein 1 the yconcrete forms -may be slowly raised through the nied-iumof airl pressure, the Anature of 'this jack-being suchl aste permit-kits manufacture, marketing and operation at l a minimum expenditure.

WithI the above and other objects in view ast-hfeinature of the invention is better understood from the-following` specification and accompanyingdrawings the same comprisestheconstruction; combination and arrangement of partsihereinafter set forth and claimed.

In :the drawings Vwherein'ilike reference characters indicate" corresponding parts throughoutthe several views, and wherein:

Figure 1 is a side elevation" of our. im-

proved jack, l

Figure Q is'a detailed vertical transverse cross-section Figure 3 section take thereof;v Y u is a: detailed transverse crossnsubstantially upon the line 3--3 of 'Figure lgand'loolingldownwardly inthe directionofth'earrows, f

Figure 4 1i and" sarthe top plan view ofthejack,

Figure 5-is`a side elevation ofourirm proved-jack, the same beingshown as-associated witlr i a concrete forni.

Now having particularI referencetothe` ISIS the provision of a cylinderpopened at itsdrawings our novel pneumatic jack embodies lower end and formedv centrally with' an open ended tube 6 througlr which yextendsv the Well known` climbing rod-7, the said' cylinder 5v having freeup and down movenient uponsaid rod.

Adjacent the upper end of this lcylinder 5 the same is internally' formedy with? ashoulder 8 for limiting the upwardfsliding' movement of .a `piston 9 that has freelrectilinear movement `within saidcylinder 5, this piston' 9 being formed -upon the upper end of4k a hollow piston rod 1() vthat encirclesf said' point -directly beneath the lower end ofthe; t

tubular piston rod l() is a collar 16 that also has free slidingmovementupon saivdlrod` and carries a pair of set screws 17 that are adapted to be forced into engagement with said rod for maintaining said collarin fixed relationthereto. A

Leading into the upper end of the cylinder 5 at a point above the piston 9 isonelend of a compressed air pipe 18, this pipe-having communication witlra suitable source of compressedair. This cylinder is also provided at its upper end with a valved exhaust 19Y -and inactual practice, a concrete vform* A, Figure 5,-issecured to the upper'end of-:thiscylinder 5 through the `medium :of rodQO and whenever itis desired to slowly raise-saidwconcrete form A, air. of a 'pre1 determined pressure is injected into the upper end of the said cylinder for consequently forcing the same upwardly upon the piston 9, it being of course understood in this connection that the collar 16 has fixed relation to the climbing rod 7. For preventing total disengagementof this piston from the cylinder the said cylinder 5 is provided adjacent its lower end with discharge orifices 21 whereby when said piston passes therebeneath, the air will be discharged through said orifices.

After the concrete form has been moved upwardly to the limit of movement of the jack the air is turned ofi". The set screws 15 and the sleeve 14 are now tightened and the air in the cylinder is let out through the exhaust, after which the set screws 17 of the collar 16 are released and the same moved upwardly upon the climbing rod, consequently forcing the piston 9 upwardly within the cylinder 5. After this operation has been completed the set screws 15 are released and the set screws 17 tightened and the air-again admitted to the cylinder 5 for4 consequently raising the form still further upwardly.

In view of the above description numerous advantages together with the specific operation of our device will be at once apparent to those skilled in the art and even though we have herein set forth the most practical embodiment of the invention with which we are at the present time familiar, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is 1. In a. pneumatic jack of the character described a cylinder attached at one end to the article to be raised and freely vertically movable upon a climbing rod, a. piston freely movable within said cylinder and adapted to be attached to said climbing rod, and an air inlet and exhaust for said cylinder above said piston.

2. In a pneumatic jack as set forth, a climbing rod, a cylinder freely vertically movable upon said climbing rod and adapted to be attached the article to be raised, a piston movable within said cylinder and adapted to be detachably secured to said climbing rod, said cylinder being provided with a compressed air inlet and exhaust above said piston, and means for securing said cylinder to said climbing rod when theJ same has been forced upwardly thereon by the air pressure injected into said cylinder.

3. In a pneumatic jack as set forth, a climbing rod, a cylinder freely movable upon said rod and adapted to be secured to the ed to be attached to said climbing rod in theraising of said article, said cylinder being' provided with a compressed air inlet and` exhaust, and means for securing said cylinder to the rod after the same has been moved upwardly thereon.

ll. In a pneumatic jack as set forth, a climbing rod, a cylinder freely movable upon said rod and adapted to be attached to the article to be raised, a piston freely movable within said cylinder, adjustable means for preventing downward movement of said piston upon said climbing rod, an air inlet and exhaust for said cylinder above said piston, said cylinder being formed with openings adjacent its lower end for permitting of the escape of the air therefrom after the cylinder has been raised upwardly to a. position above said piston, and means for securing said cylinder to said climbing rod after the same has been moved upwardly thereon.

5. A device of the class described, including a. pair of slidably interiitting members movable on a climbing rod, means on the rod for securing each of the respective members against movement thereon, and means for admitting fluid under pressure between said members for effecting al relative sliding movement thereof.

6. A device of the cla-ss described, including a pair of relatively slidable telescopically arranged vmembers having a closed cham` ber formed therebetween, and movably mounted on the rod, means for admitting fiuid under pressure to said chamber for effecting a relative sliding movement between the members, and means for securing each member against movement on the rod.

7. A device of the class described, including a pair of relatively slidable telescopically arranged members having a closed chamber formed therebetween, and movably mounted on the rod, means for admitting fluid under pressure to said chamber for effecting a relative sliding movement between the members, means for securing said member against movement on the rod, and means for limiting the movement of the members when actuated by fluid pressure.

8. A device of the class described including a pair of relatively slidable members movable on the rod, means for preventing movement of either of said members on the rod, and means for admitting fluid under pressure to said members for effecting a relative sliding movement therebetween.

9. A device of the class described comprising a pair of relatively slidable interfitting members movably mounted on a rod, means for preventing movement of either of said members on the rod, and means for produeing e relative sliding movement of the members.

10. A device of the class described comprising a pair of relatively slidable inter- 5 fitting members movably mounted on a. rod7 means for prevent-ing movement of either of said members on the rod, means for producing a. relative sliding movement of the members, and means for limiting the relative sliding` movement of said members.

In testimony whereof We aiX our signatures.

JOHN LEO STRANDBERG. LABS ERIK JULIUS BLOMBERG. 

